UK Area Code Finder
Quick and easy telephone dialling code information
UK telephone numbers beginning with '03' are used by many businesses, public services and other organisations. They are commonly used for national helplines or customer service and enquiry centres.
All UK '03' numbers:
See also: 08 numbers.
All 03 numbers are charged at the same rate and work in the same way. It is, however, possible to further subdivide them as follows:
Numbers beginning 034 and 037
034 and 037 numbers are available to companies who want an '03' number that matches an existing '08' number. For example, the owner of 0845 748 4950 would be entitled to claim 0345 748 4950, which they could use in addition to, or instead of, the original 08 number. Numbers in use include 0343, 0344, 0345, 0370, 0371 and 0372.
As the entire number must almost be dialled in full, there is no fixed format for these numbers.
The format 03xx xxx xxxx is probably the most common.